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Biden speaks at inaugural lunch

Obama vows action on climate change

The vice president stressed that the environment would not be a second-tier issue and thanked the environmental community for its support for the president.

"I came to say thank you," Biden said to thunderous applause.

While the green groups credit President Barack Obama with making significant progress on environmental issues, including with new regulations on power plant emissions and a dramatic jump in vehicle fuel-efficiency standards, many complain that he has done too little to address what scientists call an increasing threat of catastrophic climate change. The major strategy for dealing with that problem, through cap and trade, died in the Senate during Obama's first term.

Greens are looking for any sign that Obama will offer a new strategy for addressing climate. They're also calling on the president to use his rhetorical powers to drum up public support for the cause and to impose even tighter regulations on greenhouse gas emissions.

Biden offered no details about what the administration's approach will be but said, "I don't intend on ending this four years without getting an awful lot more done.”

He added: "Keep the faith."

And, in an apparent knock to Republicans who question climate science, he said, "There is science in the White House."

A slew of environmental bigwigs attended the Green Ball, including outgoing Interior Secretary Ken Salazar; Energy Secretary Steven Chu, who is expected to soon resign; Transportation Secretary Ray LaHood, who has been mum about his plans; and Rep. Ed Markey (D-Mass.), who is running for Sen. John Kerry's (D-Mass.) Senate seat.

Erica Martinson and Talia Buford contributed to this report.

This article first appeared on POLITICO Pro at 10:54 p.m. on January 20, 2013.